Tire-wrench.



A. TURNBULL.

TIRE WRENCH.v

APPLICATION FILED oer-4, I912.

Patented Apr. 27, 1915.

ALEXANDER TURNBULL, 0F GLASGOW, SCOTLAND.

TIRE-WRENCH.

Specification of Letters Patent.

Patented Apr. 27, 1915.

Application filed October 4, 1912. Serial No. 723,923.

To all whomz't may concern Be it known that I, ALEXANDER TURN- BULL, ofthe firm of Alex. Turnbull & 00., Limited, St. Mungo lVorks,Bishopbriggs, Glasgow,-Scotland, engineer, have invented a new anduseful Tire-Trench, of which the following is a specification.

This invention relates to improved appliance for use in loosening,detaching or placing pneumatic or other tires.

It frequently happens that the pneumatic or other tire adheres firmly tothe wheel rim and it is diflicult to displace same and the primaryobject of my invention is to get over this difliculty by providing amoresimple and efficient appliance for use in loosening or attaching thetiresthan those presently in existence, but it has also for its objectto assist in placing the tire in position on the wheel rim.

According to my invention, I provide a bracket arrangement one end ofwhich is in the form of a jaw which passes over the rim or over the tireand'one end of which engages with the rim. I also provide a toothedsegment or pinion which is separate from the actuating lever. The teethof the segment or pinion engage with corresponding teeth formed in achannel toward the bottom of bar or ram which slides in the other end ofbracket. One end of the sliding bar or ram is suit-ably formed so as topress against the pneumatic or other tire and so loosen the tire fromthe rim. By this arrangement the teeth in the sliding bar or ram areprotected, and the pinion prevents the sliding bar or ram from turning.The sliding bar or ram may be made in two pieces, or the end madedetachable so that a longer sliding bar or} ram may beused in order thatthe appliance may be'applicable to various sizes of tires. The applianceis plied it is pressed toward the periphery of the wheel or tire and asecure grip is thereby obtained.

In order that my invention may be properly understood and readilycarried into effect. I have hereunto appended one sheet of drawings, ofwhich Figure 1 is a side elevation of the appliance embodying myinvention, the dotted lines illustrate a tire to which the appliance isapplied in the act of being loosened or detached. Fig. 2 is an end viewof the same. Fig. 3 is a side elevation and end such that when the poweris ap-' View respectively of the shaft or spindle of the operatinglever.

According to my present improvements, the toothed segment or pinion A isformed as a separate portion of the appliance with a regular polygonallyshaped axial hole or opening by which it is mounted on a portion of theshaft or spindle E of corresponding regular polygonal shape integralwith the end of the actuating lever B,as seen more particularly in Fig.3. The pinion A fits loosely between the two flanges of the bracketwhich form the bearings for the spindle E. The object of the regularpolygonally formed shaft or spindle E is to enable the actuating leverto be readily removed and replaced in any suitable positionrendering theappliance adaptable to various sizes of tires and so that the forceapplied to the lever may be most effective. The teeth of the pinion Aengage with corresponding teeth on the sliding bar or ram 0.

It will be observed that the teeth of the rack of the sliding bar or ramC are toward the bottom of a longitudinal groove or channel in the barand that the ram C lies snugly within the circular hole or opening H ofthe bracket D, a portion of which is in the form of a jaw D, and thatthe pinion A and teeth of the same enter this groove or channel in theirengagement with the teeth of the sliding bar or ram C. therebypreventing any turning of the ram and that the teeth are well envelopedby the bracket D due to its construction. The pinion A is allowedsuflicient side-play in the bearings to prevent binding. Of course it isto be understood that the teeth need not-necessarily be at bottom of thesliding bar or ram as they may be at or near the top thereof althoughthe former is preferable. The

sliding bar or ram C may be made in two pieces, or the end C madedetachable, Fig. 1, so that a longer sliding bar or ram may be used inorder that the appliance may be applicable to various sizes of tires.

It will be seen that from the design or construction of the appliancethe act of forcing the tire out of the rim at the same time presses'theappliance toward the periphery of the wheel and tire and a. secure gripis thereby obtained. The dotted lines in Fig. 1 illustrate the slidingbar or ram C withdrawn, and also the pneumatic tire G of a Wheel in theact of being loosened or detached.

The bracket arrangement is so formed that in use it may be made to passover the rim or over the tire as may be found most suitable. Although Ihave described and shown the appliance with the end of the jaw pressingagainst the rim, and'the end of the ram pressing against the tire, thisarrangement may be reversed, or it may be so arranged that both endscould be applied to the tire.

' It will also be obvious that the appliance can readily be applied toassist in placing the tire on the rim.

Claims:

l. A tire wrench having "a tire loosening and gripping ram, andcomprising a jaw constructed at one end with a rim-bearing adapted toengage one side of the wheelrim, and at its other end with a bracketmounting the ram and presenting it in position to bear inwardly againstthe side of the tire opposite the rim-bearing; said jaw straddling theoutside of the tire when its said end and plunger are in bearingthereon; and a combined plunger-projecting and jaw-swinging levercooperating with the plunger to project it'against the tire by the samedirection of movement which, when the jaw is in the straddling positionstated,

ating said ram to reciprocate in the direction of said jaw, said meansalso guiding said ram to prevent it from turning; said means comprisinga level fulcrumed atthe free end of said bearing portion exterior tosaid ram and adapted to swing in a radial direc tion of the tire,apinion mounted coaxially with the lever fulcrumed in said bearingportion to be turned by said lever, said ram having gear teeth meshingwith said pinion; whereby a continuous pull on the lever in onedirection will first compress and thereupon remove the tire'from theWheel, when the device is applied over the tire.

In testimony whereof I affix my signature in presence of two witnesses.

ALEXANDER TURNBULL. Witnesses: 7

JOHN LIDDLE, JOHN TRAIN LIDDLEi

